<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>背景、边框样式</title>
    <style>
        .dome4div1{
            font-size: 30px;
            background-color: #e5d09d;
            background-image: url("../homework/image/nuc.png");
            background-repeat: no-repeat;
            width: 900px;
            height: 900px;
        }
        .username{
            border-color: #0000FF red green yellow;
            border-width: 1px;
            border-style: solid dotted;
            border-radius: 5px;
            width: 180px;
            height: 30px;
        }
    </style>
</head>
<body>
<div class="dome4div1">
    <label><br><br><br><br>用户名：
        <input type="text" name="username" class="username">
    </label>
</div>
</body>
</html>